Patent GB-412612-A (GB)
Title: Improvements in shuttleless loom and weft selecting mechanism therefor
IPC: D03D47/24
Filed: 1932-12-31
Abstract: 412,612. Looms with stationary weft supplies. BRITISH CELANESE, Ltd., 22, Hanover Square, London, and POOL, W., c/o British Celanese, Ltd., Spondon, near Derby. Dec. 31, 1932, No. 37009. [Classes 142 (ii) and 142 (iii).] Relates to weft measuring and selecting devices of shuttleless looms of the type in which weft is drawn into loop form prior to presentation to the inserting means. The weft-measuring apparatus comprises a number of trapping devices as described in Specification 346,850 each adapted to hold a length of weft in a straight line, drawing means comprising carriers on an endless chain adapted to engage the lengths of weft so held and draw them into loop form and selector means controlled by a dobby, jacquard, or tappets to bring about engagement between the drawing means and a particular weft length held by the trapping means. As described and shown, means is provided for selecting any one of four different wefts from either side of the loom. A weft loop for any weft is sufficient for two picks, the second pick being inserted after any number of picks of the other wefts as determined by pattern mechanism. The trapping and measuring apparatus at each side of the loom is mounted in a gear box 7, Figs. 1 and 4, and has four trapping discs 30<a>-30<d>. The discs 30<a>, 30<b> and the discs 30<c>, 30d are driven through differential gears, which, in turn, are connected by a third differential gear that is driven by the chain 5 carrying the loop-forming carriers. By locking any three of the trapping discs, the fourth is free to rotate to effect the drawing of a loop of the corresponding weft. A lever under the control of a pattern-operated cord effects the locking simultaneously to the two upper or two lower discs, while a second lever under control of another cord effects the locking of the two discs to the right or to the left. The fourth disc e.g. 30<c>, is thus free to rotate, and a carrier mounted on the chain 5 is turned from a trailing position into that shown in Fig. 4, in which pegs 133 on the carrier are moved to cross the path of the weft held between the trapping devices A, B of the disc 30<c>. A loop is thus formed, while a member engages between the pegs to draw a compensating loop within the main loop. In order to prevent the wefts between the edges of the fabric and the disc 30<c> and the corresponding disc at the other side of the loom from fouling the carriers on the chain, means is provided (Figs. 23-28, not shown) for moving the wefts below the trapping devices of the lower discs. When the loop has been formed, the pegs are again moved into trailing position, and weft depressors 277, Fig. 2, having notches 285 move the selected weft into the path of a dummy shuttle 257, Fig. 34, having a slot 271 in which are situated inwardly-turned weft-engaging hooks 272. The projecting ends of the picked wefts may be severed and sucked away through suction openings 410, Fig. 2, as described in Specifications 360,818 and 403,421. The weft ends may be trimmed by the device described in Specification 391,159, and a weft-stop motion acting on the trapped projecting weft ends as in Specification 389,875 may be provided. The width of fabric woven may be adjusted by moving the gear boxes 7, on which are mounted platforms 9 carrying the weft supplies, and their driving means towards or from the centre of the loom, and adjusting the measuring devices, while the lay is adjusted as described below. Lays ; reeds ; shuttle-boxes.-The reed is mounted on dummy swords 304, Fig. 1, movable with the main swords 281 and adjustable to the length of reed employed, while a piece 307, Fig. 2, is secured to form an extension of the shuttle-box back 288, and an angle iron 287 on the lay is inserted to guide the front edge of the shuttle. Specifications 362,979, 372,374, 412,937, and 412,938 also are referred to in the Provisional Specification.